Airworthiness Directive · Amendment 39-17522 · Electrical power
Bombardier, Inc. Airplanes
This AD applies to Bombardier, Inc. Model DHC-8-102, -103, -106, -201, -202, -301, -311, and -315 airplanes, certificated in any category, serial numbers 003 and subsequent.
We are adopting a new airworthiness directive (AD) for certain Bombardier, Inc. Model DHC-8-102, -103, -106, -201, -202, -301, -311, and --315 airplanes. This AD was prompted by reports of dual alternating current (AC) generator failure during flight. The failure was attributed to wire chafing along the wing lower flap shroud. This AD requires revising the maintenance program to incorporate certain tasks for the electrical wiring interconnection system inspection program. We are issuing this AD to prevent failure of both AC generators due to wire chafing, which could result in loss of power to the anti-icing heaters for the elevator horn, engine inlet, and propeller, and consequent ice accumulation in these areas, which could adversely affect the controllability of the airplane.
Within 30 days after the effective date of this AD: Incorporate tasks for performing a general visual inspection of the wiring and associated electrical wiring interconnection system (EWIS) components into the airplane maintenance or inspection program, as applicable, in accordance with a method approved by the Manager, New York Aircraft Certification Office (ACO), ANE-170, FAA.
Note 1 to paragraph (g) of this AD: For Model DHC-8-100 series airplanes, the instructions provided in de Havilland Dash 8 Maintenance Task Cards 531X1 and 631X1, “General visual inspection of the wiring and associated electrical wiring interconnection system (EWIS) components,” in Section 8, “Electrical Wiring Interconnection System Inspection Program,” of the Bombardier (de Havilland) Dash 8 Series 100 Maintenance Review Board Report of the Bombardier (de Havilland) Dash 8 Series 100 Maintenance Program Manual PSM 1-8-7, Revision 25, dated February 20, 2012, provides guidance for revising the maintenance program to include general visual inspections of the wiring and associated EWIS components. This service information is not incorporated by reference in this AD.
Note 2 to paragraph (g) of this AD: For Model DHC-8-200 series airplanes, the instructions provided in de Havilland Dash 8 Maintenance Task Cards 531X1 and 631X1, “General visual inspection of the wiring and associated electrical wiring interconnection system (EWIS) components,” in Section 8, “Electrical Wiring Interconnection System Inspection Program,” of the Bombardier (de Havilland) Dash 8 Series 200 Maintenance Review Board Report of the Bombardier (de Havilland) Dash 8 Series 200 Maintenance Program Manual PSM 1-82-7, Revision 16, dated February 20, 2012, provides guidance for revising the maintenance program to include general visual inspections of the wiring and associated EWIS components. This service information is not incorporated by reference in this AD.
Note 3 to paragraph (g) of this AD: For Model DHC-8-300 series airplanes, the instructions provided in de Havilland Dash 8 Maintenance Task Cards 531X1 and 631X1, “General visual inspection of the wiring and associated electrical wiring interconnection system (EWIS) components,” in Section 8, “Electrical Wiring Interconnection System Inspection Program,” of the Bombardier (de Havilland) Dash 8 Series 300 Maintenance Review Board Report of the Bombardier (de Havilland) Dash 8 Series 300 Bombardier Maintenance Program Manual PSM 1-83-7, Revision 25, dated February 20, 2012, provides guidance for revising the maintenance program to include general visual inspections of the wiring and associated EWIS components. This service information is not incorporated by reference in this AD.
The initial compliance time for the tasks incorporated into the maintenance or inspection program, as applicable, specified in paragraph (g) of this AD, is at the applicable time specified in paragraph (h)(1) or (h)(2) of this AD.
(1) For airplanes with 45,000 total flight hours or more as of the effective date of this AD: Within 1,000 flight hours after the effective date of this AD.
(2) For airplanes with less than 45,000 total flight hours as of the effective date of this AD: Within 6,000 flight hours after the effective date of this AD, but not to exceed 46,000 total flight hours.
After accomplishing the revisions required by paragraph (g) of this AD, no alternative actions (e.g., inspections) or intervals may be used, unless the actions and intervals are approved as an alternative method of compliance (AMOC) in accordance with the procedures specified in paragraph (j)(1) of this AD.
